Green Falls Reservoir Dam is an earth dam located in New London County, Connecticut, built in 1870. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 32 ft32 ft tall and 120 ft long, taller than 74% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Green Falls Reservoir Dam
The primary purpose of Green Falls Reservoir Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Connecticut Deep (state). It impounds the Green Fall River near Voluntown.
The dam stands 32 feet tall and stretches 120 feet across, creates a reservoir covering 46 acres, has a maximum storage capacity of 727 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1870, the structure is one of the older dams in the region, with over a century and a half of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 06/06/2023.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Connecticut |
| County | New London |
| Nearest City | Voluntown |
| River/Stream | Green Fall River |
| Coordinates | 41.52821, -71.80979 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 120 ft |
| Year Completed | 1870 (156 years old) |
Storage & Hydraulics
| NID Storage | 727 acre-ft |
| Max Storage | 727 acre-ft |
| Normal Storage | 727 acre-ft |
| Surface Area | 46 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 150 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Connecticut Deep |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/06/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CT00626 |
| Federal ID | CT00626 |
| More Info | State Dam Safety Program |